I kept the yellow book as a reference and still used my green one, then a couple of weeks ago when I heard we were getting new packs again, I sold my yellow one on Ebay got £19 for it.
Ooh I did this too, I never thought about selling it on Ebay, was it just the book or the whole pack you sold?
We got replacement stickers last year, but I think it depends on the consultant. I will probably just tear off the cover from my old book and staple it to the front of my new one - simple because I don't want to lose my Woman of the Year sticker, which I don't think my C would be able to replace.